cregit-Linux how code gets into the kernel

Release 4.14 arch/x86/platform/iris/iris.c

/*
 * Eurobraille/Iris power off support.
 *
 * Eurobraille's Iris machine is a PC with no APM or ACPI support.
 * It is shutdown by a special I/O sequence which this module provides.
 *
 *  Copyright (C) Shérab <Sebastien.Hinderer@ens-lyon.org>
 *
 * This program is free software ; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation ; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY ; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the program ; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/moduleparam.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <asm/io.h>


#define IRIS_GIO_BASE		0x340

#define IRIS_GIO_INPUT		IRIS_GIO_BASE

#define IRIS_GIO_OUTPUT		(IRIS_GIO_BASE + 1)

#define IRIS_GIO_PULSE		0x80 
/* First byte to send */

#define IRIS_GIO_REST		0x00 
/* Second byte to send */

#define IRIS_GIO_NODEV		0xff 
/* Likely not an Iris */

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>");
MODULE_DESCRIPTION("A power_off handler for Iris devices from EuroBraille");
MODULE_SUPPORTED_DEVICE("Eurobraille/Iris");


static bool force;

module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Set to one to force poweroff handler installation.");


static void (*old_pm_power_off)(void);


static void iris_power_off(void) { outb(IRIS_GIO_PULSE, IRIS_GIO_OUTPUT); msleep(850); outb(IRIS_GIO_REST, IRIS_GIO_OUTPUT); }

Contributors

PersonTokensPropCommitsCommitProp
Sébastien Hinderer27100.00%1100.00%
Total27100.00%1100.00%

/* * Before installing the power_off handler, try to make sure the OS is * running on an Iris. Since Iris does not support DMI, this is done * by reading its input port and seeing whether the read value is * meaningful. */
static int iris_probe(struct platform_device *pdev) { unsigned char status = inb(IRIS_GIO_INPUT); if (status == IRIS_GIO_NODEV) { printk(KERN_ERR "This machine does not seem to be an Iris. " "Power off handler not installed.\n"); return -ENODEV; } old_pm_power_off = pm_power_off; pm_power_off = &iris_power_off; printk(KERN_INFO "Iris power_off handler installed.\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sébastien Hinderer57100.00%2100.00%
Total57100.00%2100.00%


static int iris_remove(struct platform_device *pdev) { pm_power_off = old_pm_power_off; printk(KERN_INFO "Iris power_off handler uninstalled.\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sébastien Hinderer24100.00%1100.00%
Total24100.00%1100.00%

static struct platform_driver iris_driver = { .driver = { .name = "iris", }, .probe = iris_probe, .remove = iris_remove, }; static struct resource iris_resources[] = { { .start = IRIS_GIO_BASE, .end = IRIS_GIO_OUTPUT, .flags = IORESOURCE_IO, .name = "address" } }; static struct platform_device *iris_device;
static int iris_init(void) { int ret; if (force != 1) { printk(KERN_ERR "The force parameter has not been set to 1." " The Iris poweroff handler will not be installed.\n"); return -ENODEV; } ret = platform_driver_register(&iris_driver); if (ret < 0) { printk(KERN_ERR "Failed to register iris platform driver: %d\n", ret); return ret; } iris_device = platform_device_register_simple("iris", (-1), iris_resources, ARRAY_SIZE(iris_resources)); if (IS_ERR(iris_device)) { printk(KERN_ERR "Failed to register iris platform device\n"); platform_driver_unregister(&iris_driver); return PTR_ERR(iris_device); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sébastien Hinderer106100.00%2100.00%
Total106100.00%2100.00%


static void iris_exit(void) { platform_device_unregister(iris_device); platform_driver_unregister(&iris_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Sébastien Hinderer19100.00%2100.00%
Total19100.00%2100.00%

module_init(iris_init); module_exit(iris_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Sébastien Hinderer40899.76%266.67%
Rusty Russell10.24%133.33%
Total409100.00%3100.00%
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